HvW1890i

Sultan's palaces Chuini (not absolutelysure) and Chukwani palace
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This is probably Chuini palace in Zanzibar photograph taken  around 1880-1890.  Chuini means Leopard. The palace was built in 1872 by Sultan Barghash. This palace is located approx 10 km from stone-town Zanzibar. The building was modernised  and expanded by Sultan Ali bin Said.  In 1914 it was destroyed by fire.

The handwritten text on the photo says in German: Old villa of the sultan of Zanzibar (Alte Villa Sultan Sansibar)

Antique photo zanzibar

 

Chukwani Palace Zanzibar

Ref 2 also contains this photo and mentions as title Schusswani Luschtschloss des Sultans (Ref 3 Photo by J.Sturtz) 

 

References:
  1. An Arabian Princess between two worlds by E. van Donzel published by Brill  Leiden 1993
  2. Land und Leute in Duetsch Ost Afrika 1890 Wangemann (text); Sturtz (photos)
  3. Erinnerung an die Ostafrikanische Blockade und  meiner Reise an bord SMS Carola 1888-1890 (50 original photos, by naval officer J. Sturz, the album belonged to Emil Voelker and have his manuscript captions on the photos) Emil Voelker was on-board the SMS Carola during these events.